>>>However, these functions are not exported for use in kernel modules. Also, they seem to be implemented >>>for servicing user-space message-queue requests.
Yes. They are mainly made for user space functions. If you want two kernel threads to communicate using message queues ( like in other RTOS) (that too inside any LKM) best way to go for implementing one for yourself. In that way you can also achieve maximum portability. You can emulate the standard message queue calls. Even from ISR or BH you can send a message.
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